Running on Tri Labs | Data & Endurance

ASICS Superblast 3 Review: Better Than Megablast?

Sun, 08 Mar 2026 00:00:00 +0000

ASICS Superblast 3 — FF LEAP on top, FF BLAST+ underneath

I’ve been running in the Megablast and Superblast 2 for the past several months. The Megablast is fun but too fast-biased for easy days — I kept drifting above Z2 without meaning to. When the Superblast 3 came out with a new foam setup and more stack, I wanted to see if it could handle more of my training volume without that problem.

After a threshold run and a 2.5-hour progression long run, I think it can. The Superblast 3 is softer, more cushioned, and more versatile than both the Superblast 2 and the Megablast. It’s not the most exciting shoe in the ASICS lineup, but it’s the most practical one.

That’s the short version. Here’s everything else.

Specs and Comparison

	Superblast 3	Superblast 2	Megablast
Price (USD)	$210	$200	$225
Price (JPY)	¥26,400	¥24,200	¥27,500
Price (TWD)	NT$5,980	NT$5,980	NT$6,680
Weight	239 g	249 g	230 g
Stack height (heel)	46.5 mm	45 mm	45 mm
Drop	8 mm	8 mm	8 mm
Foam	FF LEAP + FF BLAST+	FF Turbo + FF BLAST+	FF Turbo²
Best for	Z2–Z3, long runs	Z2–Z3 steady	Z3–Z4, racing

ASICS lists the weight at around 239 g in US9. My pair came in at 233 g right and 231 g left. 10 g lighter than the Superblast 2 despite more stack — and it feels that way on foot.

Before even running, one thing was obvious: the Superblast 3 feels soft just walking around in it. The 1.5 mm stack increase is real, and you notice it immediately.

Fit and Sizing

True to size for me. Same size across all my ASICS shoes except the S4, where I go half up.

The fit is more trainer than race shoe. Lockdown is solid, no heel slip. The toe box has noticeably more room than the Megablast, which I appreciate. The Megablast rubs my toenail on longer runs — sometimes enough to damage socks. No sign of that in the Superblast 3 so far.

Upper feels premium. Tongue padding is excellent, no hot spots. Can’t comment on breathability yet — all my testing has been in winter.

More trainer-like fit compared to the Megablast — roomier toe box, solid lockdown

Ride Feel: Softer, Bouncier, More Cushioned

The biggest change vs. the Superblast 2 is how it rides.

The Superblast 3 is noticeably softer and bouncier, driven by the FF LEAP layer on top. On landing, it compresses quickly — you can clearly feel the softness at first contact. Then the firmer FF BLAST+ underneath provides structure and keeps the platform from going vague.

That layered behavior is easy to notice during the run. The Superblast 2 is firmer and more straightforward. The Superblast 3 has more cushioning, more energy return, and a more forgiving character overall.

Compared to the Megablast, it’s not as explosive. The Megablast has more pop and feels more speed-biased. But the Superblast 3 is easier to control, especially when the goal isn’t pushing every step.

One thing worth noting: at higher speeds, the dual-layer character fades — not because the shoe disappears, but because shorter ground contact time means less time to notice each layer separately. What you get instead is just the ride.

Stability: Slightly Less Than Superblast 2, Still Very Good

Because it’s softer, the Superblast 3 is a bit less stable than the Superblast 2. But overall stability is still very good.

Straight-line running is completely fine. Cornering is fine too, though if you’ve spent a lot of time in the Superblast 2, you’ll notice it feels slightly less planted. Not problematic — just softer.

For reference, I weigh around 73 kg fasted in the morning. The shoe holds up well at that weight. Heel strikers and slightly heavier runners should have no issues, as long as they’re not expecting the firmer SB2 feel.

Outsole pattern similar to Superblast 2 — wet grip expected to be good

Long Run: 2.5 Hours, Z2 to Z3 Progression

This was the real test.

My first run in the Superblast 3 was 3 × 15 minutes at threshold, averaging around 4:20/km. The long run the next day was 5 × 30-minute progression blocks with 2-minute rest, hitting 5:36 / 5:23 / 5:17 / 5:04 / 4:48. The shoe handled both ends of that range comfortably.

After 2.5 hours:

Cushioning still felt protective and alive as fatigue set in
Still able to accelerate and hold pace in the final 30-minute block — that matters
Bounce and stability stayed consistent throughout, no sign of foam flattening
Quads felt noticeably better than after similar efforts in the Megablast — the extra cushioning is doing real work
Toe box stayed comfortable even as feet swelled over distance

The quad difference surprised me. It’s not just a softer feel at the start — the Superblast 3 genuinely protects the legs better over long efforts.

Superblast 3 vs Megablast

Superblast 3 (left) vs Megablast (right) — similar silhouette, very different ride character

Top-down comparison — the roomier toe box on the Superblast 3 is easier to see here

This is the comparison most people want.

The difference is straightforward:

Megablast is speedier, bouncier, and more race-oriented
Superblast 3 is more cushioned, more forgiving, and more versatile

The Megablast wants to go fast. That’s fun, but it makes Z2 runs tricky — easy to drift faster than intended. The Superblast 3 is still lively but much easier to keep honest on controlled runs.

Fit-wise, the Megablast is more race-fit with a narrower toe box. The Superblast 3 feels like a premium trainer.

If you want one shoe for training and racing and care about your best race result, the Megablast has the edge.

If you already have a dedicated race shoe, or you want your daily trainer to be comfortable rather than fast, the Superblast 3 makes more sense for most runners.

There’s real overlap. If you already own a Megablast, the Superblast 3 doesn’t replace it cleanly. But it gives you a more comfortable option for the bulk of daily training.

Superblast 3 vs Superblast 2

For me, the Superblast 3 is a genuine upgrade, not just a different direction.

Softer, more cushioned, more lively, while still stable enough across a wide range of paces. The added comfort makes longer runs easier on the legs.

That said, if your favorite thing about the Superblast 2 was its firmer, more planted feel, the Superblast 3 may not be what you hoped for. It clearly moves toward a softer character. Both shoes are stable, but they feel meaningfully different.

For me, the Superblast 3 is the better overall shoe.

Who Should Buy It

Good choice if:

You want one premium trainer that handles Z2, Z3, long runs, and even race day
You already have a dedicated race shoe and want your daily trainer to be comfortable
You found the Superblast 2 a bit too firm
You do a lot of aerobic volume and want your legs to recover better
You want the most versatile shoe in the current ASICS super trainer lineup

Not ideal if:

You want the most race-biased trainer and don’t care about daily comfort
You loved the Superblast 2 specifically for its firm, stable feel
You don’t have a dedicated race shoe and need one shoe to maximize race performance

Cons

The Superblast 3 is very good, but there are real trade-offs:

Price increase on an already expensive shoe (exception: TWD pricing held flat vs SB2)
Slightly less stable than the Superblast 2, noticeable on corners
Significant overlap with Megablast if you already own both
May feel too soft for runners who preferred the firmer SB2 character
Not the best race option if you don’t have a dedicated race shoe

Verdict

The Superblast 3 is the most complete shoe in the current ASICS super trainer lineup for everyday training. Softer, more cushioned, and more forgiving than the Superblast 2, while still lively and stable enough for a wide range of paces.

It’s not as exciting as the Megablast. But it’s easier to recommend.

After a threshold run and a 2.5-hour long run progression, my conclusion is simple:

Want more speed and a better race tool? Buy the Megablast. Want more cushioning, more control, and a daily trainer that’s easier on the legs over the long haul? Buy the Superblast 3.

For my current rotation, the Superblast 3 fits better — and the long run confirmed it.

My Current Rotation

Superblast 3 — Z3 and below, long runs
Old racing shoe — Z4+ training sessions
Race shoe — race day

From Mobility and Strength to Running Form: A Full Running Mechanics Assessment

Sat, 07 Mar 2026 21:00:00 +0900

I’ve been curious about my left-right imbalance for a while. My Garmin data hints at it, and I can sometimes feel it on longer runs — one side fatigues earlier, the landing doesn’t feel quite the same. Rather than guess, I decided to get a proper running mechanics assessment done by a physiotherapist who could actually measure things.

The value wasn’t just getting filmed on a treadmill. The assessment combined a background interview, lower-limb mobility testing, strength testing with the VALD ForceFrame and Dynamo Plus, and slow-motion treadmill analysis — all in one session. That made the findings much more actionable than a standalone gait video would have been.

How the assessment worked

Five parts in total.

First, a background interview. The physio asked about my training goals, current volume, recent schedule, and how my body had been feeling. This matters because running form changes with fatigue and training phase — you can’t judge it in isolation.

Second, mobility testing. Lying down, checking lower-limb joint range of motion around the ankle, knee, and hip. The goal isn’t just finding what feels tight, but understanding whether certain movement patterns are limited by physical capacity.

Third, strength testing. Ankle plantar flexion, knee extension, knee flexion, hip abduction, and hip adduction — measured with the VALD ForceFrame and Dynamo Plus. This was the most valuable part for me. It turned a vague impression of “something’s different between sides” into numbers I can track over time.

Fourth, slow-motion treadmill analysis. We started at 9.5 km/h as a warm-up pace, then looked at my mechanics again at 11 km/h. Video from both side and rear views, observing landing position, stride length, left-right differences, foot path, and upper-body movement.

Finally, a discussion about training direction based on everything collected. The physio demonstrated part of the recommended exercises and had me try them on the spot.

Main finding: my left side is weaker

The most important result wasn’t about my running form having a visible problem. It was that my left side is relatively weaker.

Running is fundamentally a repeated single-leg support task. Every landing, every impact absorption, every push-off depends on one side doing the work independently. When there’s a strength difference between sides, it affects stability, propulsion efficiency, and movement quality as fatigue builds. Compared to debating foot strike type, left-right symmetry in force production matters more for long-term performance.

This also explains why most of the follow-up exercises prescribed were unilateral. Instead of both legs sharing the load, unilateral work forces the weaker side to carry its own weight. For a runner, that’s not just strength training — it’s building more reliable single-leg support.

No major form issues, but a few details worth noting

From the slow-motion footage, I was mostly landing midfoot. When stride length increased and cadence dropped, I shifted toward a heel strike before rolling forward into propulsion. Not surprising — foot strike isn’t a fixed label; it changes with pace and stride length.

More importantly, there was no obvious overstriding. From the side view, my landing point was roughly under my center of mass rather than way out front. That suggests stride length control and landing position are currently reasonable.

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My upper body looked slightly stiff overall. Not a postural error — the position was stable. But there’s room for the upper body to relax more and contribute more effectively. Arm swing, trunk rotation, and trunk stability all affect rhythm and smoothness, even though propulsion comes mainly from the legs.

The physio also noticed mild right-side pronation and a slight toe-out occasionally, but didn’t flag those as major issues. They were small details, not the main finding. A useful reminder: not every quirk in a gait analysis deserves equal attention. Focus stays on what has the biggest effect on stability and function.

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Improving capacity matters more than consciously changing form

My biggest takeaway: my running form doesn’t have a major problem, but the left-right strength difference is worth prioritizing.

That’s actually a good result. No obvious overstriding, landing position is reasonable — the basic structure is fine. What needs work isn’t a full form rebuild. It’s the physical capacity underneath the form, especially the strength and control difference between sides. As those improve, movement tends to shift naturally toward better efficiency without forcing it consciously.

This is also why I think this kind of assessment is valuable. Running form discussions tend to fixate on one visible trait — forefoot vs. heel strike, arm swing size, whether the posture looks “correct.” But running mechanics are really a system: mobility determines whether you can do something, strength determines whether you can do it consistently, and form is the final expression of those capacities. Looking only at the outcome without understanding the conditions behind it oversimplifies the problem.

Next step: turning the assessment into training

The most practical part was that the physio directly provided a follow-up strength program based on the findings. The emphasis was clear: not deliberately “fixing” one detail of form, but using unilateral strength work to reduce side-to-side differences and improve support, stability, and control.

That direction makes sense. What’s worth chasing isn’t a form that matches some idealized template. It’s a movement pattern that holds up under training load, stays efficient, and remains relatively stable over time.

If I had to summarize the entire assessment in one sentence: my running form is fine, my left side is weaker, and the next priority is unilateral strength work to close that gap.